ChaseDream

标题: 大家说这题选什么应该? [打印本页]

作者: napoleon100000    时间: 2006-3-16 10:57
标题: 大家说这题选什么应该?

大家说这题选什么应该?答案是D 是不是有错


Plant scientists have been able to genetically engineer vegetable seeds


to produce crops that are highly resistant to insect damage. Although


these seeds currently cost more than conventional seeds, their cost is


likely to decline. Moreover, farmers planting them can use far less pes-


ticide, and most consumers prefer vegetables grown with less pesticide,


Therefore, for crops for which these seeds can be developed, their use


is likely to become to norm.



Which of the following would be most useful to know in evaluating the


argument above?


A.     Whether plant scientists have developed insect-resistant seeds


for every crop that is currently grown commercially


B.     Whether farmers typically use agricultural pesticides in larger


amounts than is necessary to prevent crop damage


C.     whether plants grown from the new genetically engineered seeds


can be kept completely free of insect damage.


D.     Whether seeds genetically engineered to produce insect-resistant


crops generate significantly lower per acre crop yields than do


currently used seeds.


E.      Whether most varieties of crops currently grown commercially have


greater natural resistance to insect damage than did similar vari-


eties in the past.


作者: joe11    时间: 2006-3-16 12:38
这道题在B.D.间有争议。请楼主参阅以前的讨论。
作者: napoleon100000    时间: 2006-3-16 13:02
以下是引用coopers在2006-3-16 12:29:00的发言:
D is correct. no other better answers.

能不能说说选D的理由呢???我觉得D Out of scope了






欢迎光临 ChaseDream (https://forum.chasedream.com/) Powered by Discuz! X3.3